The Shadow
Alternate timeline
(covers information from an alternate timeline)
The Shadow was a radio program in 1944 of an alternate timeline.
Upon travelling back to that year, Hoshi Sato picked up a broadcast of The Shadow along with a speech by Winston Churchill. (ENT: "Storm Front")
The Shadow ran on CBS radio network (with a brief move to NBC) in various incarnations between 1930 and 1954. The title character was voiced by Orson Welles between 1937 and 1938.